package com.platform.util;

/**
 * @Description 坐标标转换工具类
 */
public class CoordinateUtil {

    /**
     * pi
     */
    public final static double pi = 3.1415926535897932384626;
    /**
     * a
     */
    public final static double a = 6378245.0;
    /**
     * ee
     */
    public final static double ee = 0.00669342162296594323;

    /**
     * @param lon
     * @param lat
     * @return
     * @Description WGS84 to 火星坐标系 (GCJ-02)
     */
    public static double[] wgs84_To_Gcj02(double lon, double lat) {
        if (outOfChina(lat, lon)) {
            return null;
        }
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        return new double[]{mgLon, mgLat};
    }

    /**
     * @param lon
     * @param lat
     * @return
     * @Description 火星坐标系 (GCJ-02) to WGS84
     */
    public static double[] gcj02_To_Wgs84(double lon, double lat) {
        double[] gps = transform(lat, lon);
        double lontitude = lon * 2 - gps[1];
        double latitude = lat * 2 - gps[0];
        return new double[]{lontitude, latitude};
    }

    /**
     * @param gg_lon
     * @param gg_lat
     * @return
     * @Description 火星坐标系 (GCJ-02) to 百度坐标系 (BD-09)
     */
    public static double[] gcj02_To_Bd09(double gg_lon, double gg_lat) {
        double x = gg_lon, y = gg_lat;
        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * pi);
        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * pi);
        double bd_lon = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        return new double[]{bd_lon, bd_lat};
    }

    /**
     * @param bd_lon
     * @param bd_lat
     * @return
     * @Description 百度坐标系 (BD-09) to 火星坐标系 (GCJ-02)
     */
    public static double[] bd09_To_Gcj02(double bd_lon, double bd_lat) {
        double x = bd_lon - 0.0065, y = bd_lat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * pi);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi);
        double gg_lon = z * Math.cos(theta);
        double gg_lat = z * Math.sin(theta);
        return new double[]{gg_lon, gg_lat};
    }

    /**
     * @param bd_lat
     * @param bd_lon
     * @return
     * @Description 百度坐标系 (BD-09) to WGS84
     */
    public static double[] bd09_To_Wgs84(double bd_lon, double bd_lat) {
        double[] gcj02 = CoordinateUtil.bd09_To_Gcj02(bd_lon, bd_lat);
        double[] map84 = CoordinateUtil.gcj02_To_Wgs84(gcj02[0], gcj02[1]);
        return map84;

    }

    /**
     * @param lat
     * @param lon
     * @return
     * @Description 判断是否在中国范围内
     */
    public static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347)
            return true;
        if (lat < 0.8293 || lat > 55.8271)
            return true;
        return false;
    }

    /**
     * @param lat
     * @param lon
     * @return
     * @Description transform
     */
    private static double[] transform(double lat, double lon) {
        if (outOfChina(lat, lon)) {
            return new double[]{lat, lon};
        }
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        return new double[]{mgLat, mgLon};
    }

    /**
     * @param x
     * @param y
     * @return
     * @Description transformLat
     */
    private static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    /**
     * @param x
     * @param y
     * @return
     * @Description transformLon
     */
    public static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }

}